JPH0117255Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-pattern stitch sewing machine, and more particularly to a pattern cam selection device.

[Conventional technology]

In conventional devices, in order to accurately position the contact of the zigzag cam and the contact of the feed cam and select the pattern reliably, the selection cam is separated into a selection cam for zigzag and a selection cam for feed. each of which was formed near the zigzag cam or feed cam. For this reason, there is a problem that the structure becomes complicated and the cost increases.Also, if the two selection cams mentioned above are formed integrally, the distance between the selection cam and one of the contactors becomes large, and the selection cam There was a problem that the amount of cam lift could not be accurately transmitted to the contact.

[Problem that the invention attempts to solve]

This invention was made to solve the above problems, and it is possible to simplify the structure by integrally forming the two selection cams, and to accurately adjust the cam lift amount of the selection cam to the contact. An object of the present invention is to provide a pattern cam selection device for a sewing machine that can transmit data.

[Means for solving problems]

For this reason, in the present invention, a first cam group that controls the swinging position of the sewing needle and a second cam group that controls the feeding motion of the feed dog are arranged corresponding to both cam groups, and each cam group first and second contacts that can be selectively engaged with one of the cams in the cam group; A sewing machine that is provided with a selection cam that is moved to a position where it can engage with a desired cam, and that forms a desired pattern by the movement of a contact according to the desired cam in each cam group, wherein both of the cam groups are parallel to a supported shaft. the selection cam is fixed to a rotating shaft that rotates in conjunction with the operation of the pattern selection operation body, and is engageable with a desired cam in each of the cam groups related to the pattern selected by the pattern selection operation body; Two selection cam surfaces are formed on one side of the selection cam for respectively moving both the contactors to positions, and the two selection cam surfaces are oscillated around a common fixed axis that is perpendicular to the rotation axis and disposed close to the selection cam. movable first and second swing levers are provided, one end of the first swing lever is connected to one of the contactors, and the other end is engageable with one of the selection cam surfaces. a third swinging lever disposed as close as possible to the other of the two contacts, the third swinging lever being swingable around a fixed axis and having one end connected to the other contact; A pattern cam selection device for a sewing machine, characterized in that one end of the second swinging lever is arranged to be engageable with one of the two selection cam surfaces, and the other end is connected to the other end of the third swinging lever. is provided.

〔Example〕

An embodiment of this invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the pillar portion of the sewing machine according to this embodiment, and FIG. 2 is a front view of the sewing machine with the machine frame removed.

A pattern cam shaft 3 is fixed to a machine frame 1 of the sewing machine in an axial direction perpendicular to a main shaft 2 of the sewing machine. The pattern cam shaft 3 includes a zigzag cam group 4 consisting of a plurality of cam plates for controlling the swinging position of the sewing needle, and a feed cam group 5 consisting of a plurality of cam plates for controlling the feeding movement of the feed dog. A helical gear 6 is rotatably supported. Both the zigzag cam group 4 and the feed cam group 5 described above are collectively referred to as a pattern cam group. The zigzag cam group 4 and the feed cam group 5 are fixed to a helical gear 6 so as to rotate together, and the helical gear 6 meshes with a multi-thread screw 7 fixed to the main shaft 2. 4 and the feed cam group 5 rotate at a reduced speed in conjunction with the rotation of the main shaft 2. A contact support shaft 8 is fixed to the machine frame 1 in an axial direction parallel to the pattern cam shaft 3. A U-shaped zigzag contact 9 is supported on the contact support shaft 8 so as to be swingable and slidable in the axial direction, and a zigzag contact support frame 10 is brought into contact with the zigzag contact 9 while holding it. It is swingably supported by the child support shaft 8. A pin 11 fixed to the zigzag contact support frame 10 is inserted through the center of the zigzag contact 9, and the zigzag contact 9 and the zigzag contact support frame 10 swing together as one in the swing direction. Only the zigzag contactor 9 is movable in the axial direction. Zigzag contact support frame 1
0 is connected to the connecting rod 12 shown in FIG.
is connected to a well-known sewing needle swinging device (not shown), so that the sewing needle swings as the zigzag contact support frame 10 swings. Also, consecutive 1
2 is biased toward the left in FIG.
is biased so as to come into contact with the cam.

Similarly, a feed contact 13 is swingably supported on the contact support shaft 8 and slidably in the axial direction, and a feed contact support frame 14 is swingably supported.
A pin 15 fixed to the feed contact support frame 14 is inserted through the center of the feed contact 13. Therefore, the feed contact 13 and the feed contact support frame 14 swing together in the swing direction, and only the feed contact 13 is movable in the axial direction. The feed contact support frame 14 is connected to a well-known feed adjuster (not shown), and the feed adjuster swings as the feed contact support frame 14 swings, thereby controlling the feed movement of the feed dog. ing. In addition, the feed contact support frame 14
A member connected to the feed contactor 13 is urged by a spring so that the feed contact 13 comes into contact with the cam of the feed cam group 5.

When selecting a pattern, the zigzag contact 9 and the feed contact 13 are slid on the contact support shaft 8 and positioned to face the cam that forms the desired pattern. At this time, it is necessary to separate each contactor 9, 13 from the cam surface so that each contactor 9, 13 does not interfere with the cams of the respective cam groups 4, 5. A release lever 16 for this purpose is swingably supported by the contact support shaft 8 in such a position as to hold the zigzag contact support frame 10. The left end of the release lever 16 extends downward and its lower end contacts the release lever 17, and the right end of the release lever 16 extends upward and further extends left and right, and zigzag contact support frames are provided at the left and right extensions, respectively. 10 and adjustment screws 18 and 19 for contacting the upper end of the feed contact support frame 14. Release lever 16
A tension spring 20 is stretched between the upper end of the frame 1 and the machine frame 1, and the release lever is biased in the counterclockwise rotation direction in FIG.

A selection cam shaft 21 is disposed below the contact support shaft 8 in an axial direction parallel to the contact support shaft 8, the right shaft end of which is supported by the machine frame 1, and the vicinity of the left shaft end supported by the machine frame 1.
The fixed internal gear 23 is fitted into and supported by a central hole 23A of a fixed internal gear 23 fixed with a screw 22, and is rotatably supported on the machine frame 1. The selected camshaft 2
1, a selection cam 24 for selecting a pattern is located directly below the zigzag cam group 4 and is fixed with a screw 25.

The selection cam 24 includes a zigzag selection cam surface 24A for positioning the zigzag contact 9 and a feed selection cam surface 2 for positioning the feed contact 13.
Two selection cam surfaces 4B and 4B are formed as face cams on one side of the selection cam 24 corresponding to each of the 21 patterns, and are integrally molded with synthetic resin.

FIG. 3 is a perspective view of the pattern selection dial 26 as a pattern selection operation body, viewed from the back side. The pattern selection dial 26 is integrally molded of synthetic resin with a release cam 27 for driving the release lever 16 shown in FIGS. 1 and 2.
The cam surface of the release cam 27 consists of a convex portion 27A formed on the same circumference and a concave portion 27B recessed from the circumferential surface. In this embodiment, the number of patterns that can be selected is 21, so the number of recesses 27B is 7, which is 1/3 of the number of patterns. A shaft cylindrical portion 26A is formed on the back surface of the pattern selection dial 26 to be inserted into the selection cam shaft 21 shown in FIG.
The shaft cylindrical portion 26A has a groove 26B cut in the circumferential direction reaching the air core part of the shaft core, and a groove 26C cut in the axial direction.
is formed.

Referring again to FIGS. 1 and 2, the pattern selection dial 26 is inserted into the left end of the selection camshaft 21, and the retaining spring 28 inserted into the groove 26B of the pattern selection dial 26 is inserted into the selection camshaft 21. It engages with a groove 29 formed on the circumference of the circumference. For this reason,
The pattern selection dial 26 is rotatably supported by the selection camshaft 21.

An annular pattern display plate 30 is inserted into a convex portion 27A of a release cam 27 formed integrally with the pattern selection dial 26 and is rotatably supported. The pattern display board 30 is molded from synthetic resin, and its surface has
21 patterns 53 are written on it, and a gear 31 is integrally molded with resin on the back side. Pattern display board 3
The back end of 0 is a decorative plate 32 fixed to the machine frame 1.
is in contact with On the decorative board 32, a pointer is displayed that indicates the shape of the selected pattern.

The rotation of the pattern selection dial 26 is reduced to 1/3 by a reduction gear mechanism using planetary gears and transmitted to the selection camshaft 21, and the rotation of the selection camshaft 21 is transmitted to the pattern display board 30 at a constant speed. It is becoming more and more common. This reduction gear mechanism will be explained.

The rotating plate 33 is attached to the selection camshaft 21 and the selection camshaft 2
1, and three planetary gears 35 are rotatably supported on the rotating plate 33 by pins 36 (in the drawing, the planetary gears 3
5 is shown). The planetary gear 35 is
It meshes with the teeth 23B of the fixed internal gear 23 fixed to the machine frame 1, and also meshes with the drive gear 37. The drive gear 37 is connected to the shaft cylinder portion 26A of the pattern selection dial 26.
The pattern selection dial 26 rotates together with the pattern selection dial 26 by engaging with the groove 26C.

Also, three pins 36 supporting the planetary gear 35
A thin plate-shaped spur gear 38 having approximately the same diameter as the pattern selection dial 26 is fitted into the pattern selection dial 26, and the spur gear 38 rotates integrally with the rotating plate 33, that is, integrally with the selection camshaft 21. The spur gear 38 meshes with a small gear 39 rotatably supported by the fixed internal gear 23, and the small gear 39 is connected to the gear 3 integrally formed with the pattern display plate 30.
meshes with 1. Since the gear 31 and the spur gear 38 have the same number of teeth, the selection camshaft 21 and the pattern display plate 30 rotate at a constant speed.

Next, the zigzag selection cam surface 24 of the selection cam 24
A mechanism for sliding and positioning the zigzag contactor 9 and the feed contactor 13 in the axial direction by following the feed selection cam surface 24B will be described.

A common fixed shaft 40 is disposed in the vicinity of the selection cam 24 in an axial direction perpendicular to the selection cam shaft 21 and is fixed to the machine frame 1 of the sewing machine. The common fixed shaft 40 has a long rod-shaped first swing lever 41 and a short L
A letter-shaped second swing lever 42 is supported so as to be swingable. A pin 43 fixed to the side surface of the lower end of the first swing lever 41 contacts the zigzag selection cam surface 24A of the selection cam 24, and a pin 44 fixed to the upper end engages with the zigzag contactor 9. . The end surface of the lower end of the second swing lever 42 contacts the feed selection cam surface 24B of the selection cam 24, and an elongated hole 45 is bored in a laterally extending portion of the L-shape.

Directly below the feed cam group 5 and at the same height as the common fixed shaft 40, a fixed shaft 46 is disposed in an axial direction perpendicular to the selection cam shaft 21 and is fixed to the machine frame 1 of the sewing machine.
An L-shaped third swing lever 47 is swingably supported on the fixed shaft 46 . A pin 48 fixed to the side surface of a laterally extending portion of the third swing lever 47 connects to the elongated hole 45 of the second swing lever 42.
A pin 49 that is fitted into and fixed to the upper end engages with the feed contact 13.

First swing lever 41 and third swing lever 47
A tension spring 50 is tensioned between the first swing lever 41 and the third swing lever 4 in the right rotation direction.
7 are each biased in the counterclockwise rotation direction. This biasing force causes the pin 43 of the first swing lever 41 to
and the lower end end surface of the second swing lever 42 abut against the zigzag selection cam surface 24A and the feed selection cam surface 24B of the selection cam 24, respectively.

Next, a mechanism for driving the release lever 16 will be explained.

A release lever shaft 51 is disposed below the pattern selection dial 26 in an axial direction parallel to the selection cam shaft 21, and is fixed to the machine frame 1 of the sewing machine. A release lever 17 is swingably supported on the release lever shaft 51. Release lever 17
extends upward through a gap between the spur gear 38 and the pattern display plate 30 which is molded with resin integrally with the gear 31, and its upper end abuts the release lever 16.
A pin 52 is fixed to the side surface of the release lever 17 for abutting against a release cam 27 that is molded of resin integrally with the pattern selection dial 26. The tension of the tension spring 20 is transmitted to the release lever 17 via the release lever 16, and the release lever 17 is biased in the clockwise rotation direction in FIG. Due to this biasing force, the pin 52 of the release lever 17 is elastically engaged with the cam surfaces 27A, 27B of the release cam 27.
The above-mentioned release lever 17 and release lever 16 constitute a release operating body.

This embodiment has the structure as described above, and its operation will be explained below.

To select a pattern, select from among the 21 model images 53 posted on the pattern display board 30, and move the desired pattern so that it is located at the position of the pointer displayed on the decorative board 32. The pattern selection dial 26 is rotated. When the pattern selection dial 26 is rotated, the pin 52 of the release lever 17 rides on the protrusion 27A on the cam surface of the release cam 27, and the release lever 17 swings in the left rotation direction in FIG. The release lever 16 whose lower end abuts the release lever 17 is swung in the clockwise direction around the contact support shaft 8, and the adjustment screws 18 and 19 of the release lever 16 are in contact with the zigzag contact support frame 10 and the feed contact, respectively. It contacts the child support frame 14 and pulls up both contact support frames 10 and 14 in the clockwise rotation direction, and the zigzag contact 9 and the feed contact 13 are separated from the cams of the zigzag cam group 4 and the feed cam group 5, respectively. . Since all of the convex portions 27A of the release cam 27 are formed on the same circumference and have the same cam height, the pin 52 of the release lever 17 moves to the next concave portion 27A.
The release lever 16 remains in the raised state until it falls to 7B.

The pattern selection dial 26 is rotated by the planetary gear mechanism 2.
3, 35, 37, the speed is reduced to 1/3 and the selection cam 24
and is transmitted to the pattern display board 30. Selection cam 24
The cam height of the selected cam surfaces 24A and 24B is such that the pin 52 of the release lever 17 is
It is formed so that it changes while it is in contact with the convex portion 27A. The first swing lever 41 swings in accordance with the change in the cam height of the zigzag selection cam surface 24A of the selection cam 24, and the zigzag contactor 9 engaged with the pin 44 of the first swing lever 41 is moved. Slide it onto the next zigzag cam. Selection cam 2
The second swing lever 42 swings in accordance with the change in the cam height of the feed selection cam surface 24B of No. 4. The swing of the second swing lever 42 is transmitted to the third swing lever 47 through the connection between the elongated hole 45 and the pin 48.
As the third swing lever 47 swings, the feed contact 13 engages with the pin 49 of the third swing lever 47.
slides and moves onto the next feed cam. As the pattern selection dial 26 continues to rotate further, the pin 52 of the release lever 17 will eventually move to the release cam 27.
It engages with the next recess 27B. At this time, the release lever 17 swings in the clockwise direction in FIG. 2, and the release lever 16 swings in the counterclockwise direction.
The adjustment screws 18 and 19 of the release lever 16 are separated from the zigzag contact support frame 10 and the feed contact support frame 14, respectively. Zigzag contact support frame 10
and the feed contact support frame 14 are rotated to the left by the biasing force of a spring (not shown) that biases them in the counterclockwise rotation direction, and the zigzag contact 9 and the feed contact 13 are rotated in the new direction of the zigzag cam group 4 and the feed cam group 5, respectively. Contact with the cam.

In this way, 1/7 of the pattern selection dial 26
Every rotation, that is, every 1/21 rotation of the selection cam 24, the cams of the zigzag cam group 4 and the feed cam group 5 corresponding to the cam heights of the selection cam surfaces 24A and 24B are selected one after another.

Since this embodiment has the structure described above, it has the following advantages.

(1) A selection cam 24 is disposed directly below the zigzag cam group 4 in an axial direction parallel to the contact support shaft 8, and
Since the common fixed shaft 40, which is the center of swing of the swing lever 41, is arranged close to the selection cam 24 in the axial direction perpendicular to the selection cam shaft 21, the cam height of the zigzag selection cam surface 24A of the selection cam 24 is is accurately transmitted to the first swing lever 41,
The zigzag contact 9 can be accurately positioned opposite the selected cam.

(2) The second swing lever 42 is the first swing lever 4
1, the cam height of the feed selection cam surface 24B of the selection cam 24 is accurately transmitted to the second swing lever 42. On the other hand, the fixed shaft 46, which is the center of swing of the third swing lever 47, is disposed directly below the feed cam group 5 at the same height as the common fixed shaft 40 and in the parallel axial direction. 2 swing lever 42
The swinging motion of the third swinging lever 47 is accurately transmitted to the third swinging lever 47, and the swinging motion of the third swinging lever 47 is accurately transmitted to the feed contact 13. Therefore, the feed contact 13 can be accurately moved and positioned by following the cam height of the feed selection cam surface 24B of the selection cam 24.

(3) First swing lever 41 and third swing lever 4
Since the tension spring 50 is tensioned between the first swing lever 41 and the second swing lever 42, there is a biasing force that simultaneously contacts the selection cam surfaces 24A, 24B of the selection cam 24. There is no need to separately provide an elastic body for each swing lever.

(4) Second swing lever 42 and third swing lever 4
7 has a structure in which a long hole 45 drilled in the second swing lever 42 and a pin 48 fixed to the third swing lever 47 engage, and the pin 4
The circumferential surface of the second swing lever 42 is tightly fitted into both sides of the elongated hole 45 and there is no play, so that the swing of the second swing lever 42 is reliably transmitted to the third swing lever 47. and has a simple structure.

[Effect of idea]

As explained above, according to the present invention, the selection cam for selecting the zigzag cam and the selection cam for selecting the feed cam can be integrally formed, and the structure can be simplified, and the structure can be simplified. An excellent effect is that the zigzag contact and the feed contact can be accurately moved and positioned according to the cam heights of the two cam surfaces.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a cross-sectional view of the pillar of the sewing machine, Fig. 2 is a front view of the sewing machine with the frame removed, and Fig. 3 is a perspective view of the pattern selection dial. It is a diagram. 1... Sewing machine frame, 2... Sewing machine main shaft, 3
...Pattern cam shaft, 4...Zigzag cam group, 5...
Feed cam group, 9... Zigzag contact, 13... Feed contact, 21... Selection cam shaft, 24... Selection cam, 24A... Zigzag selection cam surface, 24B...
Feed selection cam surface, 26...Pattern selection dial, 4
0... Common fixed shaft, 41... First swing lever,
42...Second swing lever, 45...Elongated hole, 46
...Fixed shaft, 47...Third swing lever, 48...
...Pin, 50...Tension spring.

Claims (1)

[Claims for Utility Model Registration] 1. A first cam group that controls the swinging position of the sewing needle and a second cam group that controls the feeding movement of the feeding dog;
First and second contacts are disposed corresponding to both of the cam groups and can be selectively engaged with one cam in each cam group, and are operated in conjunction with the operation of the pattern selection operation body. , a selection cam for moving each of the contacts to a position where it can engage with a desired cam in its corresponding cam group, and a desired pattern is formed by movement of the contact according to the desired cam in each cam group. In the sewing machine, the selection cam is fixed to a rotating shaft that is parallel to the shaft on which both of the cam groups are supported and rotates in conjunction with the operation of the pattern selection operation body, Two selection cam surfaces are formed on one side of the selection cam for moving both of the contacts to positions where they can be engaged with desired cams in each of the cam groups regarding the pattern, and two selection cam surfaces are formed on one side of the selection cam and are perpendicular to the rotation axis. first and second swing levers that are arranged close to the selection cam and are swingable around a common fixed axis; one end of the first swing lever is connected to one of the two contacts; The other end is arranged to be engageable with one of the two selection cam surfaces, the other end is swingable around a fixed axis arranged as close as possible to the other of the two contactors, and the one end is arranged to be able to engage with one of the two selection cam surfaces. a third swinging lever connected to the third swinging lever; one end of the second swinging lever is arranged to be engageable with one of the selection cam surfaces, and the other end is connected to the third swinging lever; A pattern cam selection device for a sewing machine, characterized in that it is connected to an end. 2. An elastic body is stretched between the first and third swing levers in order to elastically engage the first and second swing levers with both the contacts, respectively. A pattern cam selection device for a sewing machine according to claim 1 of the utility model registration claim. 3. The pattern selection cam for a sewing machine according to claim 1, wherein the second and third swing levers are connected by a pin and a long hole provided on both levers. Device.